Refrigerator



FIG. 1 is a front elevation view of a refrigerator, the rear elevation, right side elevation, left side elevation, top plan, and bottom plan views being omitted as not including any claimed features; and,

FIG. 2 is an enlarged view thereof.

The broken lines represent unclaimed features that form no part of the claimed design. 

CLAIM The ornamental design for a refrigerator, as shown and described. 